$ git clone -n https://src.fedoraproject.org/rpms/R-date.git /var/lib/mock/f45-build-6067-346/root/chroot_tmpdir/scmroot/R-date
Cloning into '/var/lib/mock/f45-build-6067-346/root/chroot_tmpdir/scmroot/R-date'...
$ git fetch origin 47f2e0b037826d0829fbc7f8b444dd3611d7f9c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-date
 * [new ref]         47f2e0b037826d0829fbc7f8b444dd3611d7f9c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47f2e0b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild